I'm confused on what the differences between these blocks.

Sound effects are these blocks:

They change the pitch of your music and which speakers are playing it.

The clear sound effects sets these blocks back to 0.

The Stop all sounds, stops the music that's being played

CamG777 wrote:

Sound effects are these blocks:

They change the pitch of your music and which speakers are playing it.

The clear sound effects sets these blocks back to 0.

The Stop all sounds, stops the music that's being played

Ohh– I see– I didn't realize there were sound effect blocks because I don't usually work with sound blocks

“Clear all sound effects” removes all the sound effects from all the audios (E.G. Pitch).
For example, you would use this block here:

“Stop all sounds” clears the sounds that the sprite is playing.